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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Python 3.8 emits SyntaxWarning for "is" with a literal in clang-format.py"
href="https://bugs.llvm.org/show_bug.cgi?id=44162">44162</a>
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<th>Summary</th>
<td>Python 3.8 emits SyntaxWarning for "is" with a literal in clang-format.py
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>9.0
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Formatter
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>lukas.karnowski@gmail.com
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<th>CC</th>
<td>djasper@google.com, klimek@google.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>Since Python 3.8 a SyntaxWarning is emitted if a literal is compared with "is"
or "is not". Currently clang-format.py:123 uses the following comparison, which
produces the warning:
if op[0] is not 'equal':
Reproducable with Python 3.8:
<span class="quote">> python --version</span >
Python 3.8.0
<span class="quote">> python
>>> "foo" is "bar"</span >
<stdin>:1: SyntaxWarning: "is" with a literal. Did you mean "=="?
False
Additional information: <a href="https://bugs.python.org/issue34850">https://bugs.python.org/issue34850</a>
The solution is simply to use "!=" instead of "is not".</pre>
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